Archives of Microbiology (2025) recently published a groundbreaking study titled “Integrative bioinformatics and chemotactic insights into p-nitrophenol bioremediation by halotolerant aquatic Pseudomonas sp. strain PNPBRP5(2)” by Alam et al. from The University of Burdwan, India.
The researchers isolated a halotolerant, Gram-negative bacterium from pond water that efficiently degrades p-nitrophenol (PNP)—a toxic compound widely used in dyes, pesticides, and explosives. Within 60 hours, the strain PNPBRP5(2) degraded 98% of PNP at 0.5 mM concentration, releasing harmless nitrite and transforming PNP through p-benzoquinone (PBQ) as an intermediate.
Chemotaxis assays revealed the bacterium’s ability to actively move toward pollutants, particularly showing the strongest attraction toward 4-aminophenol and PNP itself. This movement enhances contact with contaminants, making bioremediation more efficient.
To uncover the molecular mechanisms behind this process, the team applied bioinformatics and molecular docking tools to model the p-nitrophenol-4-monooxygenase (pnpA) enzyme, identifying key amino acid residues involved in PNP binding and degradation. The findings confirm the enzyme’s strong catalytic efficiency and affinity for PNP.
Overall, this study highlights a novel aquatic Pseudomonas strain with dual capabilities—chemotaxis and enzymatic degradation—making it a promising candidate for eco-friendly detoxification of industrial and agricultural wastewater contaminated with nitrophenols.
Reference
Alam, S. A., Khan, B., Karmakar, D., Mandal, R., & Saha, P. (2025). Integrative bioinformatics and chemotactic insights into p-nitrophenol bioremediation by halotolerant aquatic Pseudomonas sp. strain PNPBRP5(2). Archives of Microbiology, 207(12), 318. https://doi.org/10.1007/s00203-025-04461-6
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